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Journal articles
Quantifying the combined effects of the heating time, the temperature and the recovery medium pH on the regrowth lag time of Bacillus cereus spores after a heat treatment
Abstract : The purpose of this study was to quantify the lag time of re-growth of heated spores of Bacillus cereus as a function of the conditions of the heat treatment: temperature, duration and pH of the recovery medium. For a given heating temperature, curves plotting lag times versus time of heating show more or less complex patterns. However, under a heating time corresponding to a decrease of 2 decimal logarithms of the surviving populations of spores, a linear relationship between the lag time of growth and the time of the previous heat treatment can be observed. The slope of this linear relationship followed itself a Bigelow type linear relationship, the slope of which yielded a - value very close to the observed conventional z-value. It was then concluded that the slope of the regrowth lag time versus the heating time followed a linear relationship with the sterilisation value reached in the course of the previous heat treatment. A sharp effect of the pH of the medium which could be described by a simple "secondary" model was observed. As expected, the observed intercept of the linear relationship between lag time and heating time (lag without previous heating) was dependent on only the pH of the medium and not on the heating temperature.
Cited literature [19 references]
https://hal.univ-brest.fr/hal-00653930
Contributor : Marielle Le Guen Connect in order to contact the contributor
Submitted on : Tuesday, December 20, 2011 - 4:22:15 PM
Last modification on : Tuesday, October 12, 2021 - 3:49:07 AM
Long-term archiving on: : Wednesday, March 21, 2012 - 2:50:12 AM
Contributor : Marielle Le Guen Connect in order to contact the contributor
Submitted on : Tuesday, December 20, 2011 - 4:22:15 PM
Last modification on : Tuesday, October 12, 2021 - 3:49:07 AM
Long-term archiving on: : Wednesday, March 21, 2012 - 2:50:12 AM
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